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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "src/zone/zone.h" | 5 #include "src/zone/zone.h" |
6 | 6 |
7 #include <cstring> | 7 #include <cstring> |
8 | 8 |
9 #include "src/v8.h" | 9 #include "src/v8.h" |
10 | 10 |
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98 | 98 |
99 // Un-poison the segment content so we can re-use or zap it later. | 99 // Un-poison the segment content so we can re-use or zap it later. |
100 ASAN_UNPOISON_MEMORY_REGION(current->start(), current->capacity()); | 100 ASAN_UNPOISON_MEMORY_REGION(current->start(), current->capacity()); |
101 | 101 |
102 segment_bytes_allocated_ -= size; | 102 segment_bytes_allocated_ -= size; |
103 allocator_->ReturnSegment(current); | 103 allocator_->ReturnSegment(current); |
104 current = next; | 104 current = next; |
105 } | 105 } |
106 | 106 |
107 position_ = limit_ = 0; | 107 position_ = limit_ = 0; |
108 | |
109 allocation_size_ = 0; | 108 allocation_size_ = 0; |
110 // Update the head segment to be the kept segment (if any). | |
111 segment_head_ = nullptr; | 109 segment_head_ = nullptr; |
112 } | 110 } |
113 | 111 |
114 // Creates a new segment, sets it size, and pushes it to the front | 112 // Creates a new segment, sets it size, and pushes it to the front |
115 // of the segment chain. Returns the new segment. | 113 // of the segment chain. Returns the new segment. |
116 Segment* Zone::NewSegment(size_t requested_size) { | 114 Segment* Zone::NewSegment(size_t requested_size) { |
117 Segment* result = allocator_->GetSegment(requested_size); | 115 Segment* result = allocator_->GetSegment(requested_size); |
118 DCHECK_GE(result->size(), requested_size); | 116 DCHECK_GE(result->size(), requested_size); |
119 segment_bytes_allocated_ += result->size(); | 117 segment_bytes_allocated_ += result->size(); |
120 if (result != nullptr) { | 118 if (result != nullptr) { |
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176 // size bytes + header and alignment padding) | 174 // size bytes + header and alignment padding) |
177 DCHECK(reinterpret_cast<uintptr_t>(position_) >= | 175 DCHECK(reinterpret_cast<uintptr_t>(position_) >= |
178 reinterpret_cast<uintptr_t>(result)); | 176 reinterpret_cast<uintptr_t>(result)); |
179 limit_ = segment->end(); | 177 limit_ = segment->end(); |
180 DCHECK(position_ <= limit_); | 178 DCHECK(position_ <= limit_); |
181 return result; | 179 return result; |
182 } | 180 } |
183 | 181 |
184 } // namespace internal | 182 } // namespace internal |
185 } // namespace v8 | 183 } // namespace v8 |
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